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Effect of Structural Elasticity on Slamming Against Wetdecks of Multihull Vessels
Kvalsvold, Jan,Faltinsen, Odd M.,Aarsnes, Jan V. The Society of Naval Architects of Korea 1997 Journal of ship and ocean technology Vol.1 No.1
Hydroelastic slamming against the wetdeck of a multihull vessel is studied numerically and experimentally. The beam equations and a two-dimensional flow model are used to find the dynamic stresses in longitudinal stiffeners between two transverse stiffeners. The largest stresses in the structure occur in the time scale of the lowest wet natural period of the beam. A simple relation between the maximum stress, the local geometry and the impact velocity of the wetdeck is established. The stresses in the wetdeck are neither sensitive to the radius of curvature of the waves nor where the waves initially hit the wetdeck. It is concluded that the maximum impact pressure should not be used to find maximum bending stresses during wetdeck slamming.
Shao, Yan-Lin,Faltinsen, Odd M. The Society of Naval Architects of Korea 2014 International Journal of Naval Architecture and Oc Vol.6 No.4
This paper presents some of the efforts by the authors towards numerical prediction of springing of ships. A time-domain Higher Order Boundary Element Method (HOBEM) based on cubic shape function is first presented to solve a complete second-order problem in terms of wave steepness and ship motions in a consistent manner. In order to avoid high order derivatives on the body surfaces, e.g. mj-terms, a new formulation of the Boundary Value Problem in a body-fixed coordinate system has been proposed instead of traditional formulation in inertial coordinate system. The local steady flow effects on the unsteady waves are taken into account. Double-body flow is used as the basis flow which is an appropriate approximation for ships with moderate forward speed. This numerical model was used to estimate the complete second order wave excitation of springing of a displacement ship at constant forward speeds.
Yan-Lin Shao,Odd M. Faltinsen 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.4
This paper presents some of the efforts by the authors towards numerical prediction of springing of ships. A time-domain Higher Order Boundary Element Method (HOBEM) based on cubic shape function is first presented tosolve a complete second-order problem in terms of wave steepness and ship motions in a consistent manner. In order toavoid high order derivatives on the body surfaces, e.g. mj-terms, a new formulation of the Boundary Value Problem in abody-fixed coordinate system has been proposed instead of traditional formulation in inertial coordinate system. Thelocal steady flow effects on the unsteady waves are taken into account. Double-body flow is used as the basis flowwhich is an appropriate approximation for ships with moderate forward speed. This numerical model was used toestimate the complete second order wave excitation of springing of a displacement ship at constant forward speeds.